How much fun can you pack into one birthday trip? I started with a drink ... non-alcoholic, of course. And then things starting going faster after that: a sauna at the Oberstegen, continued with skiing on the Hintertux Glacier, went for a SUP paddling tour in an ice cave river under that glacier, and ended up climbing to the Grafenloch and Rossstall caves, and doing a 3D model of them. Not bad, and that was just the first day! Maybe for my next birthday I'll try to come with an active program.